Renew even if the old item looks O.K - why? Because these are designed to be used only once. They spread when the cover is tightened, this gives an oil tight seal. Once used, that elasticity is no longer present.
You may wish to add this related seal to your order:
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Use the same Gaskets as the factory professionals. Did you need to order bearings - CMS probably have most or all of what you require. Our pro-workshop gasket sealant: 08CRAHLG120G to complete the job like a professional.